Abstract
Nowadays, nanotechnology is one of the most potential tools in the modern agriculture to improve productivity, adaptation to climate change and sustainable development. In this study, the effect of nanoscale zerovalent cobalt (NZVC) on the growth, photosynthetic parameters expressed by Fo (initial fluorescence), Fm (maximal fluorescence), Fv/Fm (maximal photochemical efficiency), ΦPSII (effective quantum yield of photosystem II), ETR (photosynthetic electron transport rate), Pn (net photosynthetic rate) and content of chlorophyll a and b at different stages in soybean leaves were investigated. The NZVC made from Vietnam and USA with different concentrations (0, 0.17 and 16.7 mg/kg seed) were used. It was found that when soybean seeds were treated with NZVC, the growth indices (such as the plant height, dry weights of stems and leaves and leaf area), photosynthetic parameters and chlorophyll a and b content were increased obviously compared with that of the control. These values had tended to gradually increase and reach maximum at fifth (V5) trifoliate stage, whereas they were significantly decreased at begin at flowering (R1) stage. The real productivity of the experimental formulas exceeded the control (5%), while the quality of grain was significant different among the plots. The zerovalent cobalt nanoparticle from Vietnam exhibited similar efficiency compared to those that came from USA. Our results indicated that photosynthesis was positively affected by NZVC, leading to the improved growth of soybean and therefore to improved productivity as a whole.
Highlights
Nanoparticles are typically ultrafine particles with size ranging from 1 to 100 nm [1]
These results indicated that the nanoparticles had a positive effect on the growth of soybean at vegetative growth stages
Our findings are in agreement with Gad et al [22] which reported that the cobalt supplement significantly improved all the growth parameters of soybean, such as plant height, leaf area, both the dry weight of stems and leaves especially at 12 mg/L
Summary
Nanoparticles are typically ultrafine particles with size ranging from 1 to 100 nm [1]. In comparison with ordinary substances, nanomaterials possess different physical, chemical and biological properties owing to their smaller size and Cobalt (Co) plays an essential role in the plant growth development by regulating plant water utilization and reducing transpiration rate, especially, for nodule formation and N2 fixation processes [7]. It is an essential element for the synthesis of various enzymes and coenzymes like vitamin B12 (cyanocobalamin), which are required for human and animal nutrition [8]. The root mitotic index of soybean was increased 37.3% compared to control
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